The head of America's intelligence community says spying on allies is nothing new.

National Intelligence Director James Clapper told Congress Tuesday that spying on world leaders is a "longtime practice."

His testimony comes after allegations that the National Security Agency has been listening in on phone calls and hacking emails of European leaders.

Clapper said the outrage in Europe is overblown.

"We do not spy on anyone except for valid foreign intelligence purposes, and we only work within the law," Clapper said.

How bad is the NSA scandal for the Obama administration and for the United States? John Whitehead, a constitutional attorney and author of the book, AGovernment of Wolves: the Emerging American Police State, explains more, on CBN Newswatch, Oct. 29.

Sen. Diane Feinstein, D-Calif., is breaking ranks with her party, saying she will launch a congressional review of all the U.S. spy programs.

Feinstein chairs the Senate Intelligence Committee, which is typically known for standing side-by-side with President Barack Obama and the National Security Agency.

Meanwhile, Spain is the latest country to begin looking into allegation of being the target of U.S. surveillance.

The country's prosecutor's office says it's opening a preliminary investigation into reports the NSA monitored more than 60 million phone calls in Spain in just one month.

That investigation comes as a Capitol Hill hearing on NSA tactics kicked off Tuesday. The head of the agency was grilled by lawmakers looking for answers.